Leslie P. Langworthy (1848–1919) was an American architect from Providence, Rhode Island.

Life and career Leslie Pendleton Langworthy was born in 1848 in Little Genesee, New York. He began practicing as an architect in Rhode Island during the 1880s.List of Architects and Classified Directory of First Hands in the Building Trade. 1885. He was alone until about 1910, when he incorporated his sons into his new firm of L. P. Langworthy & Company.Annual Report of the State Auditor. 1911. He died in Providence in 1919.The Langworthy Family: Some Descendants of Andrew and Rachel (Hubbard) Langworthy who Were Married at Newport, Rhode Island, November 3, 1658. 1940.

He is best remembered for the Richardsonian Romanesque design of the Washington County Courthouse in West Kingston.

Architectural works 1891 - Beacon Avenue Primary School, 104 Beacon Ave, Providence, Rhode IslandAnnual Report of the Superintendent of Public Buildings for the Year 1891. 1892. 1892 - Washington County Courthouse, 3481 Kingstown Rd, West Kingston, Rhode IslandAnnual Report of the State Auditor, January, 1895. 1895. 1897 - Hope Valley School (Remodeling), Main St, Hope Valley, Rhode IslandSoares, Joseph P. Images of America: Washington County. 2005. Demolished 1902 - Providence Smallpox Hospital, Fields Point, Providence, Rhode IslandAmerican Architect and Building News 20 Sept. 1902: x. Demolished 1908 - East Hall, University of Rhode Island, Kingston, Rhode IslandReport of the Board of Managers, Bulletin of the Rhode Island College of Agriculture and Mechanic Arts, For February, 1909. 1909. 1912 - Riverside Grammar School, 100 Bullocks Point Ave, Riverside, Rhode IslandAnnual Report of the State Board of Education. 1913. 1912 - Rumford Grammar School, 64 Bourne Ave, Rumford, Rhode Island Demolished

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